Â鶹Éç

Available for over a year

The invasion of probes to Mars with Kelly Beatty of Sky and Telescope Magazine. The moon formed when the Earth experienced a large impact - discussion with Lunar Prospector mission manager Scott Hubbard. Plus what was happening among the stars and planets in April 1999. This is a programme from the Â鶹Éç World Service Archive and was originally broadcast in 1999.